var state = 'hidden';
function showhide(layer_ref) 
	{
	if (state == 'visible') 
		{
		state = 'hidden';
		}
	else 
		{
		state = 'visible';
		}
	if (document.all) 
		{ //IS IE 4 or 5 (or 6 beta)
		eval("document.all." + layer_ref + ".style.visibility = state");
		}
	if (document.layers) 
		{ //IS NETSCAPE 4 or below
		document.layers[layer_ref].visibility = state;
		}
	if (document.getElementById && !document.all) 
		{
		maxwell_smart = document.getElementById(layer_ref);
		maxwell_smart.style.visibility = state;
		}
	}